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feat: active filter subscription management for edge nodes ## Subscription Manager * edgeFilterSubLoop reconciles desired vs actual filter subscriptions * edgeFilterHealthLoop pings filter peers, evicts stale ones * EdgeFilterSubState per-shard tracking of confirmed peers and health * best-effort unsubscribe on peer removal * RequestEdgeShardHealth and RequestEdgeFilterPeerCount broker providers ## WakuNode * Remove old edge health loop (loopEdgeHealth, edgeHealthEvent, calculateEdgeTopicHealth) * Register MessageSeenEvent push handler on filter client during start * startDeliveryService now returns `Result[void, string]` and propagates errors ## Health Monitor * getFilterClientHealth queries RequestEdgeFilterPeerCount via broker * Shard/content health providers fall back to RequestEdgeShardHealth when relay inactive * Listen to EventShardTopicHealthChange for health recalculation * Add missing return p.notReady() on failed edge filter peer count request * HealthyThreshold constant moved to `connection_status.nim` ## Broker types * RequestEdgeShardHealth, RequestEdgeFilterPeerCount request types * EventShardTopicHealthChange event type ## Filter Client * Add timeout parameter to ping proc ## Tests * Health monitor event tests with per-node lockNewGlobalBrokerContext * Edge (light client) health update test * Edge health driven by confirmed filter subscriptions test * API subscription tests: sub/receive, failover, peer replacement Co-authored-by: Ivan FB <128452529+Ivansete-status@users.noreply.github.com> Co-authored by Zoltan Nagy